const puppeteer = require('puppeteer');

  const options = {
  path: 'Pantallazo.png',
  fullPage: false,
  clip: {
    x: 0,
    y: 0,
    width: 1280,
    height: 1150
  }
}

puppeteer.launch().then(async browser => {
  const page = await browser.newPage();
  await page.setViewport({ width: 1280, height: 800 });
  await page.goto('https://portalcfdi.facturaelectronica.sat.gob.mx/');
  await page.screenshot(options);
  await page.goto('https://cfdiau.sat.gob.mx/nidp/app/login?id=SATx509Custom');
  await page.waitForNavigation({ waitUntil: 'load' });

  const txtCertificate = await page.$('#fileCertificate');
  await txtCertificate.uploadFile('/angel/proyectos/FIEL/ura930831kb3.cer');

  const txtPrivateKey = await page.$('#filePrivateKey');
  await txtPrivateKey.uploadFile('/angel/proyectos/FIEL/Claveprivada_FIEL_URA930831KB3_20161107_181656.key');

  await page.screenshot({path: 'scren.png'});

  await browser.close();

});